Express Scripts Holding Co. (NASDAQ:ESRX) excluded 25 additional drugs and reinstated seven in the 2015 update to its national preferred formulary. Next year's list removed one drug class and added 10 classes compared with 2014. The full list is available online.

New drug class "other direct-acting antivirals" is not shown below because it does not yet list any exclusions. (A) Generic version(s) approved; (B) Authorized generics; Sources: BCIQ: BioCentury Online Intelligence; Express Scripts